The ring R in the arrangement shown can slide along a smooth, fixed, h

1.	The ring R in the arrangement shown can slide along a smooth, fixed, horizontal rod XY. It is attached to the block B by a light string. The block is released from rest, with the string horizontal.(a) One point in the string will have only vertical motion. (b) R and B will always have momenta of the same magnitude. (c) When the string becomes vertical, the speeds of R and B will be inversely proportional to their masses. (d) R will lose contact with the rod at some point.
Answer» Correct Answer is: (a, c) There are no horizontal forces acting on the ‘R plus B’ system. Hence, its centre of mass will move down vertically, and horizontal momentum will be conserved.

The ring R in the arrangement shown can slide along a smooth, fixed, horizontal rod XY. It is attached to the block B by a light string. The block is released from rest, with the string horizontal.(a) One point in the string will have only vertical motion. (b) R and B will always have momenta of the same magnitude. (c) When the string becomes vertical, the speeds of R and B will be inversely proportional to their masses. (d) R will lose contact with the rod at some point.

Answer»

Correct Answer is: (a, c)

There are no horizontal forces acting on the ‘R plus B’ system. Hence, its centre of mass will move down vertically, and horizontal momentum will be conserved.

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